Recording apparatus



Sept. 4, 1923.

E. HODGKINSON RECORDING APPARATUS Filed Oct. 18 1922 IHI HIM-

pi m l lliil HHII Patented Sept. 4, 1923.

UNITED: STATES PATENT OFFICE.

EDWIN HODGKINSON, OF ROCHESTER, NEW YORK, ASSICNOR TO TAYLOR INSTRUMENT COMPANIES, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

rmcoamno APPARATUS.

Application filed October 18, 1922. Serial No. 595,421.

To aZZ whom it may concern:

Be it known that I, EDWIN HODGKINSON, a citizenof the United States residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Recording Apparatus; and I do hereby declare the following to be a full, clear, and exact description of the same, reference be ng had to the accompanying drawing, forming a part of this specification, and to the reference numerals marked thereon.

This invention relates to recording apparatus or instruments, such, for example, as the general variety disclosed in my prior Letters Patent No. 1,060,761 granted May 6, 1913, and more particularly to provisions in such apparatus facilitating the handling of the record charts, The chief object of the invention is to provide such an instrument having simple and practical means for quickly and conveniently detaching or stripping a record chart fromthe means for supporting and driving' the same, to facilitate its removal from the instrument. To these and other ends the invention consistsin certainimprovements ,and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed Figure 1 is a face view of a portion of a recording instrument, partly broken away, embodying the present invention;

Figure 2 is a sectional view of the same on the line 2- a of Figure 1 Figure 3 is a view similar to Figure 2 with portions omitted however and showing the parts in a different operating position; and

Figure 4: is a detailed sectional view on the line 4-4 of Figure 1.

Similar reference numerals throughout the several views indicate the same parts.

The invention is embodied in the present instance in conjunction with a recording instrument such as disclosed in my said Letters Patent, for recording temperatures or pressures, comprising a casing 5 enclosing a time controlled driving mechanism in an auxiliary casing indicated at 6, from which extends a driving spindle 7 carrying a relatively small disk 8 for driving the chart. Spindle 7 is extended forwardly of the disk as at 9 to provide means forcooperation with the usual central opening in the chart to center the same in position on the instru ment and the disk is formed with pointed elements 10 adapted to'pierce a chart pressed into position against the disk, for releasably securing the same to the driving means thus forme p The record chart is supported by a plate 11 of generally circular shape, as shown in Figure 1, and arranged concentrically of the chart spindle with a central opening 12 slightly larger than the chart disk to receive the latter, the plate and disk being disposed substantially inthe same plane, as shown in Figure 2, so thatthe chart secured to the driving means or disk as described lies also against the plate 11 and is supported thereby. A suitable marking device or pen arm (not shown) is provided of course with suitable actuating means therefor, as well understood in the art but the con: struction of such portions formsno part of the present invention. Plate 11 is cut off.

along a line 13 and at spaced points adacent its side13 is indented, as shown at 14, (Figure 4;) and the indentation perforated to fit loosely a stud or screw 15 carried by a post 16 extending forwardly from the back of the casing. The screws 15, of which in the present instancethere are two, as shown,- thus afford a mounting for the supporting plate 11 on which the latter has aswinging movement, relative to the chart driving disk, forwardly of the plane of the disk for detaching or stripping the chart therefrom. A stud 17 projecting forwardly upon the rear of the instrument casing serves as a stop for locating the plate in its normal position in the plane of the disk to which position it is urged by coiled compression springs 18, Figure 4, carried in pockets 19 in posts 16, and bearing at their outer ends against the plate adjacent its side 13. A finger piece 20 is fixed on the plate on the side thereof 0pposite its mounting by means of which the plate may be swung forwardly as described to carry the record chart with it and strip the same from the driving means to facilitate its removal from the instrument. Plate 11 may be provided with fingers 21 if desired, for overlapping and retaining the periphery of the chart in position. The casing, as shown in Figure 2, is provided with a cover 22 of suitable construction.

The record chart is applied to the instrument by opening the cover, fitting the usual central openin of the chart on post 9 and pressing it against disk 8 to cause the pointed elements of the latter to penetrate and retain the chart, supporting plate 11 at this time being of course in the position shown in Figure 2. The instrument is then ready for operation and after the desired record has been made on the chart thecasing cover is opened and finger piece 20 grasped and plate 11 pulled forwardly on its mountings. Such movement of plate 11 carries the chart with it and detaches or strips the same from the piercing elements 10 so that the chart may then be quickly and conveniently removed from the machine. plate 11 is returned to normal position by springs 18. v

The construction is, as shown, simple, practical and inexpensive in construction and efficient in operation, enabling an operator to quickly and conveniently remove a chart from the instrument.

I claim as my invention:

1. The combination with a recording instrument of chart supporting and driving means comprising a chart driving portion having means for releasably securing a chart thereto and a chart supporting portion extending about said driving portion and mounted on the instrument for movement relative to said driving portion to trip a chart therefrom.

2. The combination with a recordin instrument of chart supporting and driving means comprising a rotary chart driving portion having means for releasably securing a chart thereto, a non-rotary chart sup porting portion surrounding said driving portion, and means for mounting saidsupporting portion on the instrument to afford a movement thereof relative to said driving portion to stri a chart from the latter.

3. The combination with a recordin instrument of chart supporting and driving means comprising a rotary chart driving Upon release disk having means for releasably securing a chart thereto and a non-rotary chart supporting plate surrounding said disk and mounted on the instrument for movement relative to said disk to strip a chart therefrom.

4. The combination with a recording instrument of chart supporting and driving means comprising a chart driving portion having means for releasably securing a chart thereto, a chart supporting plate normally disposed substantiall in the plane of said driving portion an having an opening therein receiving the latter, and means for mounting said plate on the instrument to afford a swinging movement thereof relative to said driving portion to strip a chart therefrom.

5. The combination with a recording instrument of chart supporting and driving means comprising a rotary chart driving disk having means for releasably securing a chart thereto, a chart supporting plate normally disposed substantially in the plane of said driving portion and having an opening therein receiving the latter, means supporting said ford a swinging movement thereof relative to said disk to strip a chart therefrom, and resilient means for returning said plate to normal position.

6. The combination with a recording instrument of chart supporting and driving means comprising a rotary chart driving disk having means for releasably securing a chart thereto, a chart supporting plate normally disposed substantially in the plane of said driving portion and having an opening therein receiving the latter, spaced posts on the instrument loosely engaging said plate to support the same for swinging movement relative to said disk to stripa chart therefrom, manually engageable means for swinging the plate and'spring means for restoring the plate to normal po sition.

EDWIN HODGKINSON.

late on the instrument to af-. 

